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I didn't see any way to associate a diff tool with BC to compare directories. I'd suggest submitting a feature request to the TortoiseSVN guys. In the meantime, you may be able to work around it by replacing TortoiseMerge.exe with a copy of BComp.exe. It will get overwritten any time you upgrade though.

if i do 'diff with url' on the folder,
a window with the list of files pops up, and i can select an individual file to view the "file" diff.
I though there might be some short-cut to diff viewer in this case.

I tried to replace tortoiseMerge with BComp.exe.
but with BComp.exe, no file list window pops up and
only first file of the list is shown on the session menu of BC3.

I'll take a look at this on Monday. If we can easily parse the command line to get the list of files then it should be easy enough to add support for it. If it requires actually communicating with SVN we're not likely to get to it soon, in which case I still encourage you to submit an enhancement request to TortoiseSVN, which would allow it to work with other third-party differs.

Sorry, we won't be able to do this soon. Tortoise passes a path file (the same as our File Comparison Report's "Patch" output), and TortoiseMerge internally splits that up into the list of files and applies the patches to generate the original files for the comparison. That's been requested in the past, but it's a significant feature, and definitely not something we could whip out in an afternoon. If comparing/applying patches isn't in our request list already I'll add that, with a note to support TortoiseMerge's command line once we do.